Title
Graywacke Siltstone
Identifier
FR-5
Description
Angular, silty size gains, composed of equal parts quatz, feldspars and rock fragments. Prominent orange and brown surface oxydation on all samples. Some samples contain evidence of bedding planes. Calicte is found along bedding planes, as well as on some surfaces perpendicular to bedding. Some samples include very fine calcite veins (<0.5mm) intersecting through the bedding planes. (FOV: 1.28)
Date
Not given
Contributor
Western Minerals, Inc.
Spatial Coverage
Roadcut on south side of Petaluma Pt.
Reyes Station road 1/2 mi. upstream (east) from dam which is about 4 miles east of Point Reyes Station.
Reyes Station road 1/2 mi. upstream (east) from dam which is about 4 miles east of Point Reyes Station.
Temporal Coverage
Mesozoic
Accrual Method
Purchased from Western Minerals, Inc.
Number of Thin Sections
1